Friction-clutch



(No Model.)

P. P, CANPIELD.

FRICTION GLUTGH.

Patented Jan. 18,1898

F 'g. E. E INVENTEIR- WITN EEEEE. mmaw @ZMJMW UNITED STATES PATENTanion,

FELIX P. CANFIELD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CLARENCE XV.STETSON, OF NEWTON, MASSACHUSETTS.

FRiCTlON-GLUTCH.

SPECIFIGATION forming part of Letters Patent No, 597,479, dated January18, 1898.

Application filed May 19, 1897. Serial No. 687,210. (No model.)

To all whom it may concern.-

Be it known that I, FELIX P. CANFIELD, of Boston, in the county ofSufiolk and State of lliassachnsettshave invented certain newand usefulImprovements in Friction-Clutches,of which the following, taken inconnection with the accompanying drawings, is a specification.

This invention is in the nature of an im- IO provement upon that setforth in the United States Letters Patent granted to me May 19, 1896,No.560,470, for friction-cutches. In said patented device a severed elasticring was expanded into frictional engagem cut with r 5 the inner face ofan annular flange of the pulley or clutch-body by means of a curvedlever pivoted between the terminal shoulders of said ring and extendedinwardly beyond the axis of said flange to be actuated by a short shaftprojecting through the coveringplate and having an independent bearingtherein. Such former device Was Well adapted for large pulleys orclutches, but for those of small diameter a simpler apparatus is verydesirable and is herein set forth.

My present improvement is embodied in a pulley or clutch-body having anannular flange with a smooth internal surface concentric with its shaft,and a transversely-severed 3o elastic ring mounted on the carrying-platewithin said flange and adapted to he'enlarged into frictional contacttherewith, in combination with an eccentric-strap having a radial stemconnected to said carrying-plate 3 5 and located between the ends of thesevered ring, and with an eccentric Within said strap, ring, and flange,and provided with a projecting member to engage the shipper mechanism,preferably a tubular sleeve surrounding 0 the shaft made integral withthe eccentric and spirally grooved to receive the actuatingstuds on theshipper-sleeve. Other novel features are rigid struts or curvedprojections formed on the carrying-plate, semicircular covering-platesperpendicular to the shaft and secured by screws entering said struts orprojections, a peripheral groove in the neck of the eccentric-sleeve toreceive the edges of said governing-plates, the severed ring overlappingthe periphery of the carrying-plate and supported by studs through thecovering and carrying plates, and the sliding shippersleeve providedwith a peripherally-adjust able spline not entering the shaft.

In the drawings, Figure l is a longitudinal section of the improvedclutch. Figs. 2 and 3 are transverse sections on the line 2 3 of Fig. 1,showing a change of position by partial rotation of the eccentric. Fig.4 is aside and end view of the adjustable spline. Fi 6o 5 is anelevation of the eccentric and its grooved sleeve, and Fig. 6 a plan ofone of the covering-plates.

A represents the rotary shaft, and B the pulley or clutch-body formedwith the annular flange B, having the smooth circular inner surface forengagement when the clutch is operated. The outer surface of this flangemay carry the driving-belt, or such flange may be formed laterally on alarger pulley, or a complete pulley may be fixed upon the hub shown aspart of the body 13 and thus actuated by the clutch.

C is the carrying-plate located within the flange B and formed with anelongated hub C, surrounding the shaft A, to stiffen and support saidplate. A key 0 secures the hub and plate to the shaft. Rigid struts orcurved projections D, Figs. 2 and 3, are cast integral. with the plate Cto strengthen it and support the covering-plates E. These plates areflat semicircular castings secured by screws passing through screw-holesc and fixed in the rigid projections D. Such plates overlap the outeredges of the flange l3 and cover the in- 8 5 closed parts of the clutchmechanism.

F represents the elastic severed ring normally fitting loosely withinthe flange B and secured to the carrying-plateC by ascrew G, passingthrough the covering-plate E and an 0 elongated slot f in said ring andentering the carrying-plate C, as in Fig. 1. Such ring is severed at apoint opposite to the slot f, and its ends form enlarged shoulders FWith parallel surfaces. The inner edge of this ring 5 overlaps theperiphery of the carrying-plate on which it is mounted, so as to bearupon the entire inner surface of the flange B frictionally.

Between the shoulders F of the severed 10o ring is the stem II of theeccentricstrap H, such stem being anchored to the carryingplate 0 by thescrew G, passing through the covering-plate E and an elongated slot insaid stem and being fixed firmly in said carrying plate. The screws Gand G therefore secure ered ring and expanding said ring into strongfrictional contact with the flange B, as in Fig. 3-. This produces theclutch action and communicates to the shaft A the rotation assumed to beimparted to the pulley B.

The eccentric .I is a part of a peculiar casting (shown in Fig. 3)having a groove 3' concentric with the shaft to receive the inner.

curved edges of the covering-plates E, which stand perpendicular to theshaft and hold the eccentric in true position for its work. Beyond thegroove j the casting is prolonged as an enlarged circular sleeve J andis formed with two spiral grooves K to be traversed by theactuatingstuds which give'to the eccentric its limited oscillatingmotion.- An open space is left within the sleeve J for the m We ment ofthe part which carries these studs.

L represents the shipper-slide, consisting of a tube arranged betweenthe shaft A and sleeve J and having rigid studs L at one end projectingoutwardly into the groo ves K and at the other end formed with tworadial flanges Z, between which the shipper-lever (not shown) works.This tube or slide has a longitudinal movement along the shaft, but mustrevolve with it when the clutch is engaged, and it is desirable to beable to adjust such slide circumferentially. I therefore provide ahollow spline or core on which the slide fits and moves, and provide itwith a set-screw by which it may be fixed in position and readjusted bya circumferential movement when desired. As here shown in full lines inFig. L and dotted lines in Fig. 1, this device is in the form of acollar M, having two longitudinal prongs or splines m fitting incorresponding longitudinal grooves within the tubular slides L, but notentering the shaft A. It is obvious that such splines or an angular coresubstituted therefor can be adjusted circumferentially of the shaft asthey .could not be if fitting into grooves therein as With an ordinarykey. A collar N on shaft A keeps the clutch-body B in proper relation tothe other parts.

In practice I make the curved struts D of such size as to firmly supportthe ring F, and I finish the exterior of said ring thereon before it issevered and secure thereby a cylindrical surface of the ring barelyfitting Within the flange B. Then I sever the ring, leaving theshoulders F parallel,and by a few hammer blows on its peripherylimpartsome elasticity, causing it to cling to the struts when not expanded.

I claim as my invention 1. In afriction-clutch a policy or clutchbodyhaving an annular flange with a smooth internal surface concentric withits shaft, a

carrying-plate, and a transversely-severed elastic ring mounted on saidplate within said flange and adapted to be enlarged into clutchin gcontact therewith, in combination with an eccentric strap having aradialstem connected to said carrying-plate between the ends of the severedring, an eccentric located within said strap, ring and flange, andformed with a projecting-member adapted for engagement with a shippermechanism to actuate the clutch, substantially as set forth.

2. In a friction -clutch, the clutch body formed with an annular flangewith a smooth internal surface concentric with the shaft, a carryingplate, and a transversely-severed elastic ring mounted on said platewithin said flange and adapted to be enlarged into clutching contacttherewith, in combination with an eccentric-strap having a radial stempivoted to said-carrying-plate between the ends of the severed ring, aneccentric located within said strap and formed with a projectingsleeves-urrounding'the shaft, and shipper mechanism engaging with saidsleeve to oscillate the eccentric, substantially as set forth.

3. In a friction-clutch,a clutch-bodyhavin g an annular flange, a radialcarryingplate within said flange and provided with rigid struts orprojections, and covering-plates secured to said projections, incombination with a, transversely-severed elastic ring adapted to beenlarged into contact with said flange,

flange formed with a central hub adapted to Y be keyed to the shaft andwith rigid projecting struts, and semicircular covering-platesperpendicular to the shaft secured on said struts to inclose the clutchproper, in combination with a transversely-severed elastic ring anchoredto said carrying-plate and overhanging its periphery so as tobearcircumferentially against the entire inner surface of the clutch-flange,an eccentric-strap within said ring and an eccentric surrounding theshaft and formed with a grooved tubular neck adapted to be oscillated bythe shipper mechanism, substantially as set forth.

5. In a friction-clutch,the annularly-flanged revolving body and thecarrying-plate keyed to the shaft and supporting the expansible clutchapparatus to engage with said body,

in combination with a shipper-sleeve having In testimony whereof I havesigned my a sliding movement on the shaft and grooved name to thisspecification, in the presence of IO longitudinally in its inner wall,and with a, two subscribing witnesses, on this 4th day ofoiroumferentially-adjustable core or spline May, A. D. 1897.

having a cylindrical bore to fit the shaft, ribs FELIX P. GANFIELD. orprongs to fit within the shipper-sleeve and Witnesses: a set-screw tofix its position when adjusted, A. H. SPENCER,

substantially as set forth. NVARREN F. GILBERT.

